Coupe De Etat

Before you play choose up to 5 Colors, Coupe De
Etat is those Colors.
You may tap any number of legendary creatures,
Coupe De Etat cost {1} less for each creature
tapped this way.
Target a Legendary Creature you control then exile
your Commander(s) from the game until Coupe De
Etat leaves play, The targeted creature is your
Commander. When Coupe De Etat leaves play, return
your original Commander(s) to the command zone.